You are given a 0-indexed integer array nums of length n where n is the total number of students in the class. The class teacher tries to select a group of students so that all the students remain happy.
The ith student will become happy if one of these two conditions is met:
nums[i].nums[i].Return the number of ways to select a group of students so that everyone remains happy.
\n\n\n
Example 1:
\n\n\nInput: nums = [1,1]\nOutput: 2\nExplanation: \nThe two possible ways are:\nThe class teacher selects no student.\nThe class teacher selects both students to form the group. \nIf the class teacher selects just one student to form a group then the both students will not be happy. Therefore, there are only two possible ways.\n\n\n
Example 2:
\n\n\nInput: nums = [6,0,3,3,6,7,2,7]\nOutput: 3\nExplanation: \nThe three possible ways are:\nThe class teacher selects the student with index = 1 to form the group.\nThe class teacher selects the students with index = 1, 2, 3, 6 to form the group.\nThe class teacher selects all the students to form the group.\n\n\n
\n
Constraints:
\n\n1 <= nums.length <= 1050 <= nums[i] < nums.lengthnums[i] = x is selected, all the students with nums[j] <= x must be selected.",
"If a student with nums[i] = x is not selected, all the students with nums[j] >= x must not be selected.",
"Sort values in nums and try all possible values for x from 0 to n separately."
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